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CVE-2026-3119 is a denial-of-service vulnerability in ISC BIND 9's named daemon triggered during processing of an authenticated DNS query containing a TKEY record. The flaw is a NULL pointer dereference in dns_tkey_processquery() in lib/dns/tkey.c. In affected code paths, the keyname variable can remain NULL for TKEY DELETE mode and certain invalid TKEY modes, yet execution continues into response construction where keyname is passed through add_rdata_to_list() to dns_name_copy(). This reaches an assertion that assumes a valid source name, causing a reachable assertion failure and abrupt process termination. The issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9.18.x and 9.18-S1 are not affected.
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A vulnerability in ISC BIND 9 where an authenticated query containing a TKEY record may cause the named process to terminate unexpectedly.
An authenticated denial-of-service vulnerability in BIND named caused by a NULL pointer dereference in `dns_tkey_processquery()` when processing TKEY records. A signed TKEY DELETE request or certain invalid TKEY modes can cause `named` to abort unexpectedly.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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